It's far too early to say. You can't move a conference to a different country on a short notice. You can only hold it with whatever audience you can get, postpone it, or cancel it. For larger events, it's already too late to move events scheduled for 2026, and possibly even for 2027. Maybe there will be some data in a couple of years, but until then, anecdotes and informed guesses are the best you can have.
It's harder of a choice the closer the event date is, but sometime it's just the most responsible thing to do. You won't see many people coming to your event if it's now in a war zone for an extreme example.
It’s not the choice that is hard, it’s the logistics of changing such. Huge event on such a short notice. It’s simply not possible, so you can cancel if you feel your guests would not be safe, yeah. But who would agree to that? It could very well bankrupt the conference.
